Hypotenuse,Adjacent and opposite in a triangle and these sides can be worked out
A triangle
-- Make sure you have the lengths of all three sides -- Add up the lengths of all three sides to get the perimeter of the triangle.
If you mean side lengths of 5, 4 and 1 then it is not possible to construct any triangle from the given dimensions.
three
No
No
Yes, an Isosceles.
triangle
A trapezoid and a triangle can make a triangle or another trapezoid, among others.
Any shape that is enclosed and has three sides is a triangle.
a pentagon